<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - shader [Monjori]</title>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
		<link type="text/css" rel="stylesheet" href="main.css">
	</head>
	<body>

		<div id="container"></div>
		<div id="info"><a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - shader demo. featuring <a href="http://www.pouet.net/prod.php?which=52761" target="_blank" rel="noopener">Monjori by Mic</a></div>

		<script id="vertexShader" type="x-shader/x-vertex">

			varying vec2 vUv;

			void main()	{

				vUv = uv;

				gl_Position = vec4( position, 1.0 );

			}

		</script>

		<script id="fragmentShader" type="x-shader/x-fragment">

			varying vec2 vUv;

			uniform float time;

			void main()	{

				vec2 p = - 1.0 + 2.0 * vUv;
				float a = time * 40.0;
				float d, e, f, g = 1.0 / 40.0 ,h ,i ,r ,q;

				e = 400.0 * ( p.x * 0.5 + 0.5 );
				f = 400.0 * ( p.y * 0.5 + 0.5 );
				i = 200.0 + sin( e * g + a / 150.0 ) * 20.0;
				d = 200.0 + cos( f * g / 2.0 ) * 18.0 + cos( e * g ) * 7.0;
				r = sqrt( pow( abs( i - e ), 2.0 ) + pow( abs( d - f ), 2.0 ) );
				q = f / r;
				e = ( r * cos( q ) ) - a / 2.0;
				f = ( r * sin( q ) ) - a / 2.0;
				d = sin( e * g ) * 176.0 + sin( e * g ) * 164.0 + r;
				h = ( ( f + d ) + a / 2.0 ) * g;
				i = cos( h + r * p.x / 1.3 ) * ( e + e + a ) + cos( q * g * 6.0 ) * ( r + h / 3.0 );
				h = sin( f * g ) * 144.0 - sin( e * g ) * 212.0 * p.x;
				h = ( h + ( f - e ) * q + sin( r - ( a + h ) / 7.0 ) * 10.0 + i / 4.0 ) * g;
				i += cos( h * 2.3 * sin( a / 350.0 - q ) ) * 184.0 * sin( q - ( r * 4.3 + a / 12.0 ) * g ) + tan( r * g + h ) * 184.0 * cos( r * g + h );
				i = mod( i / 5.6, 256.0 ) / 64.0;
				if ( i < 0.0 ) i += 4.0;
				if ( i >= 2.0 ) i = 4.0 - i;
				d = r / 350.0;
				d += sin( d * d * 8.0 ) * 0.52;
				f = ( sin( a * g ) + 1.0 ) / 2.0;
				gl_FragColor = vec4( vec3( f * i / 1.6, i / 2.0 + d / 13.0, i ) * d * p.x + vec3( i / 1.3 + d / 8.0, i / 2.0 + d / 18.0, i ) * d * ( 1.0 - p.x ), 1.0 );

			}

		</script>

		<script type="importmap">
			{
				"imports": {
					"three": "../build/three.module.js",
					"three/addons/": "./jsm/"
				}
			}
		</script>

		<script type="module">

			import * as THREE from 'three';

			let camera, scene, renderer;

			let uniforms;

			init();

			function init() {

				const container = document.getElementById( 'container' );

				camera = new THREE.OrthographicCamera( - 1, 1, 1, - 1, 0, 1 );

				scene = new THREE.Scene();

				const geometry = new THREE.PlaneGeometry( 2, 2 );

				uniforms = {
					time: { value: 1.0 }
				};

				const material = new THREE.ShaderMaterial( {

					uniforms: uniforms,
					vertexShader: document.getElementById( 'vertexShader' ).textContent,
					fragmentShader: document.getElementById( 'fragmentShader' ).textContent

				} );

				const mesh = new THREE.Mesh( geometry, material );
				scene.add( mesh );

				renderer = new THREE.WebGLRenderer();
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				renderer.setAnimationLoop( animate );
				container.appendChild( renderer.domElement );

				window.addEventListener( 'resize', onWindowResize );

			}

			function onWindowResize() {

				renderer.setSize( window.innerWidth, window.innerHeight );

			}

			//

			function animate() {

				uniforms[ 'time' ].value = performance.now() / 1000;

				renderer.render( scene, camera );

			}

		</script>

	</body>
</html>
